Overview
Description
RAJ240055/RAJ240057 are Renesas battery fuel gauge and management devices which combine a separate MCU and AFE blocks in a single package to accomplish various battery protection and management functions. RAJ240055/RAJ240057 incorporate advanced battery management features such as primary and secondary protection, voltage and current measurement, current integrating, and host communication interface. Through user programmable control firmware and configuration data stored in the onboard MCU’s embedded flash memory, the embedded analog and digital hardware circuits offer optimum battery management operations including high accuracy remaining capacity estimation and battery safety.
Features
- Fully integrated battery management solution with battery capacity measurement and programmable protection capability.
- Supports up to 4 Li-ion or Li-Polymer battery cells in series.
- Supports various self-diagnosis functions for functional safety.
- Integrated with Renesas Ultra Low Power RL78 CPU core for multi-function process.
- Memory
Code flash memory: 64 kB (RAJ240055) / 128 kB (RAJ240057)
Data flash memory (up to 100,000 erase/write cycles): 4 kB
SRAM: 4 kB (RAJ240055) / 7 kB (RAJ240057) - Clock generator
High speed on-chip oscillator: up to 32 MHz
Low speed on-chip oscillator: 15 kHz
AFE high speed on-chip oscillator: 4.194 MHz
AFE low speed on-chip oscillator: 131.072 kHz - General Purpose I/O Ports
Total: 12 pins
CMOS input/output: 6, CMOS input: 1
N-ch open drain Input/output [6 V tolerance]: 3
High voltage input [30 V tolerance]: 1
High voltage input/output [VCC tolerance]: 1 - Serial interface
CSI (SPI): 1 channel
UART: 2 channels
Simplified I2C: 1 channel
I2C: 1 channel - Timer
MCU 16-bit timer: 6 channels
MCU 12-bit interval timer: 1 channel
AFE timer: 2 channels- AFE timer A: setting range: 125 ms to 64 s
- AFE timer B: setting range：61 us to 2 s
- Embedded A/D converter
AFE 15-bit resolution sigma-delta A/D converter- Automatic measurement mode
- Continuous measurement mode
- Current integrating circuit
18-bit resolution sigma-delta A/D converter - Impedance measurement circuit
Simultaneous measurement of battery voltage and current - Over current detection circuit
Short circuit current detection: 2 channels
Charge overcurrent detection
Discharge overcurrent detection
Charge wakeup current detection
Discharge wakeup current detection
DBPT current detection - Series regulator
2.0 V or 3.3 V output can be selected (> 20 mA) - Charge and Discharge MOSFET control
Supports High-side Nch MOSFET drive (built-in charge pump circuit) - Ultra Low Power consumption
Power down mode: 1 uA
Sleep mode1 current: 20 uA (DFET and CFET off)
Sleep mode2 current: 40 uA (DFET and CFET on)
In Sleep mode, enable H/W protection function - Additional features
Internal Cell Balancing Circuit (>10 mA)
Internal Watchdog Timer (MCU)
MCU Runaway Detection Circuit (AFE)
3 Thermistor Sensor Ports with On-chip Pull-up Resistors
Random cell connection tolerant - Voltage and temperature condition
Power supply voltage: VCC = 2.2 to 25.0 V
Operating ambient temperature TA = -40 to +85°C - Package Information
32 pin plastic mold QFN
([Body] 4.0 mm x 4.0 mm, 0.4 mm pitch)
Comparison
Applications
Documentation
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| Type | Title | Date |
| Datasheet | PDF 2.63 MB | |
| Product Reliability Report | PDF 194 KB | |
| Flyer | PDF 417 KB 日本語 , 简体中文 | |
3 items
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Design & Development
Support
Support Communities
Videos & Training
Renesas' Battery Management System with Fixed Firmware (R-BMS F) is a fixed firmware solution designed for the RAJ240100, RAJ240090, and RAJ240055 3–10 cell FGICs. The RTK0EF0136DK0002BU evaluation kit uses the RAJ240090/100, while the RTK0EF0163DK0002BU evaluation kit uses the RAJ240055. Both evaluation kits include an intuitive GUI tool that provides a comprehensive and flexible battery management system for accurate state-of-charge monitoring.
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